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Wyświetlanie 1-15 z 26
Tytuł:
Materials and methods supporting nerve regeneration in peripheral and central nervous system
Autorzy:
Laska, J.
Bednarz, P.
Lis, A.
Szarek, D.
Powiązania:
https://bibliotekanauki.pl/articles/286123.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polyurethane
polylactide
polymer blends
implants
neuroregeneration
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 95-96
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and Assessment of Polymeric Laminate blended composites Reinforced with Bi-Woven Aramidic Fiber
Autorzy:
Amarababu, B.
Rangadu, V. P.
Powiązania:
https://bibliotekanauki.pl/articles/411638.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
laminates
polymer blends
thermomechanical
chemical resistance
Opis:
In the present paper evaluates laminated aramidic bi-woven fibers reinforced in polyester-vinylester blended composites. The Duo polymers, polyester-vinylester were blended using in situ polymerization technique. Four planar layers were made simultaneously and keeping one over another and each layer make sure to be weighed off 15% were maintained in all layers with different orientations. Pre-assumed Layer-1(50/50) 50 %, 0º; Layer-2(35/35/30) 35 % 0º, 35 % +45º, 30 %,0; Layer-3 (25/50/25) 25 % 0º, 50% +45º, 25-45º; Layer-4 (25/25/25/25) (2 5% 0º, 25 % +45º, 25 % -45º, 25 % 90º). Tthe composite was prepared with the help of hand layup technique. Test ready specimens were the help of shearing machine in accordance with ASTM. It was observed that, polyester and vinylester had good miscibility makes combined solid material. Flexural strength, tensile strength was improved up to 3ed layer, decreases after, whereas flexural modulus and tensile modulus were linearly increased up to 4th layer. Thermal stability and glass transition temperature were also found satisfactory for all the laminated layers. Chemical resistance was good for the entire chemical except toluene.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 99-110
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymerization shrinkage of resin mixtures used in dental composites
Autorzy:
Pałka, Krzysztof
Janiczuk, Patrycja
Kleczewska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/286221.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymer blends
volumetric shrinkage
dimetacrylates
dental composite
Opis:
Polymerization of dental composites generates shrinkage in the matrix resulting in numerous clinical problems. The influence of the most commonly used resins on the shrinkage process has not been thoroughly examined so far in the literature. The purpose of this work is to determine the effect of the resin mixture compositions on the volumetric polymerization shrinkage. The mixtures used in the tests were pre-pared in specific weight proportions to determine the influence of particular monomers, such as Bis-GMA, Bis-EMA, UDMA, and TEGDMA. The shrinkage measurements were performed using the self-designed video-imaging device. The studies showed that the shrinkage decreased in opposite to the Bis-GMA concentration in the mixture with the simultaneous decrease in the Bis-EMA content. The shrinkage value decreased in opposite to the molecular weight only for some monomers and compositions. Bis-EMA resin as a flexible monomer achieved the lower shrinkage values than UDMA, and the highest shrinkage values, above 6%, were achieved by compositions with the 14wt% content of Bis-GMA. Regarding the shrinkage, the most optimal composition was 56wt% Bis-GMA with the addition of Bis-EMA (24wt%) and TEGDMA (20wt%). The obtained shrinkage value was 4.73%.
Źródło:
Engineering of Biomaterials; 2020, 23, 154; 16-21
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymerization shrinkage of resin mixtures used in dental composites
Autorzy:
Pałka, Krzysztof
Janiczuk, Patrycja
Kleczewska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1844982.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
polymer blends
volumetric shrinkage
dimetacrylates
dental composite
Opis:
Polymerization of dental composites generates shrinkage in the matrix resulting in numerous clinical problems. The influence of the most commonly used resins on the shrinkage process has not been thoroughly examined so far in the literature. The purpose of this work is to determine the effect of the resin mixture compositions on the volumetric polymerization shrinkage. The mixtures used in the tests were pre-pared in specific weight proportions to determine the influence of particular monomers, such as Bis-GMA, Bis-EMA, UDMA, and TEGDMA. The shrinkage measurements were performed using the self-designed video-imaging device. The studies showed that the shrinkage decreased in opposite to the Bis-GMA concentration in the mixture with the simultaneous decrease in the Bis-EMA content. The shrinkage value decreased in opposite to the molecular weight only for some monomers and compositions. Bis-EMA resin as a flexible monomer achieved the lower shrinkage values than UDMA, and the highest shrinkage values, above 6%, were achieved by compositions with the 14wt% content of Bis-GMA. Regarding the shrinkage, the most optimal composition was 56wt% Bis-GMA with the addition of Bis-EMA (24wt%) and TEGDMA (20wt%). The obtained shrinkage value was 4.73%.
Źródło:
Engineering of Biomaterials; 2020, 23, 154; 16-21
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and thermal properties of PP/PBT blends compatibilized with triblock thermoplastic elastomer
Autorzy:
Ignaczak, W.
Wiśniewska, K.
Janik, J.
El Fray, M.
Powiązania:
https://bibliotekanauki.pl/articles/779101.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
polymer blends
PP/PBT
triblock copolymer
SEBS
compatibilization
Opis:
A linear triblock copolymer, poly(styrene-b-etylene/butylene-b-styrene)(SEBS) thermoplastic elastomer (TPE) grafted with maleic anhydride was used for compatibilization of PP/PBT blends. PP/PBT blends of different mass ratios 60/40, 50/50, 40/60 were mixed with 2.5, 5.0 and 7.5 wt.% of SEBS copolymer in a twin screw extruder. Differential scanning calorimetry and dynamic mechanical analysis were performed to define the phase structure of PP/PBT blends. TPE with a rubbery mid-block shifted the glass transition of PP/PBT blend towards lower temperatures, and significant decrease the crystallization temperature of a crystalline phase of PP component was observed. The influence of the amount of compatibilizer and the blend composition on the mechanical properties (tensile and flexural strengths, toughness and moduli) was determined. Addition of 5 wt.% of a triblock TPE led to a three-fold increase of PP/PBT toughness. A significant increase of impact properties was observed for all materials compatibilized with the highest amount of SEBS copolymer.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 78-83
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of chitosan/hyaluronic acid blend films modified by collagen
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Grabska, Sylwia
Michalska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1034575.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
collagen
hyaluronic acid
polymer blends
surface properties
Opis:
In the present study, thin films based on the blends of chitosan (Ch) and hyaluronic acid (HA) with and without collagen (Coll) were characterised using tensile tests, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis (TGA). Ch/HA and Ch/HA/Coll polymer blends were prepared using the solvent evaporation technique. The interactions between polymer components in the binary and ternary blends were studied by FTIR analysis. Mechanical properties were studied and compared with those of simple polymer films. These results show that the addition of collagen into Ch/HA blends led to the increase of tensile strength and Young modulus. Moreover, it was found that the thermal stability of the Ch/HA binary blend significantly increased upon the addition of collagen.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 125-134
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the type solvent on the structure of chitosan blends with hyaluronic acid
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Grabska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/1034698.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
hyaluronic acid
microscopy.
polymer blends
surface properties
Opis:
The influence of the type solvent on the structure of chitosan, hyaluronic acid and their blend films was investigated. Aqueous acetic acid, hydrochloric acid, sodium chloride and aqueous acetic acid/NaCl were used as solvents for chitosan, hyaluronic acid and Ch/HA solution blends. Ch, HA and their blend films were prepared by casting technique. The homogeneity and morphology of chitosan blends were ascertained from the tapping-mode atomic force microscopy (AFM) and scanning electron microscopy (SEM). The changes of topography images are considered by determining the root mean square (RMS, Rq) deviation in the image data. The surface roughness of chitosan, hyaluronic acid and Ch/HA blended films was altered by mixing. The structure of chitosan blends with hyaluronic acid depends on the blend composition and on the solvent used for preparing the blend.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 147-153
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viscometric studies of chitosan/polyacrylamide mixtures
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Krasińska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035184.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
miscibility criteria
polyacrylamide
polymer blends
viscosity interaction parameters
Opis:
Polymer-polymer interactions and miscibility for chitosan (Ch) and partially hydrolysed polyacrylamide (HPAM) have been investigated using dilute solution viscosity. The intrinsic viscosity, [η], and the viscosity interaction parameters, bm, have been determined for the binary (solvent/polymer) and ternary (solvent/polymer A/polymer B) systems. Degree of miscibility of these polymer mixtures was estimated on the basis of two criteria. The final result depends on (i) the applied extrapolation method used for determination of the interaction parameters, (ii) the assumed miscibility criteria, and (iii) the blend composition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 73-78
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viscometric studies of microcrystalline chitosan/poly(vinyl alcohol) mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035416.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
microcrystalline chitosan
poly(vinyl alcohol)
polymer blends
viscometric study
Opis:
In the present paper, the results of viscosity measurements in dilute solutions of microcrystalline chitosan (MCCh) with poly(vinyl alcohol) (PVA) of different degrees of hydrolysis are presented. Microcrystalline chitosan is blended with poly(vinyl alcohol) in aqueous 0.1 MCH3COOH/0.2 M NaCl. Viscosity measurements of dilute polymer solution were carried out in an Ubbelohde capillary viscometer. The final result depends on (I) the thermodynamic goodness of the solvent, on (II) the applied extrapolation method used for determination of the interaction parameters, on (III) the assumed miscibility criteria, on (IV) the degree of hydrolysis of PVA, and on (V) the blend composition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2011, 16; 43-48
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miscibility and interactions in chitosan and polyacrylamide mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035186.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
FTIR analysis
chitosan
polyacrylamide
polymer blends
surface properties
Opis:
In the present work, the results of Fourier transform infrared (FTIR) and atomic force microscopy (AFM) studies of films of chitosan acetate (ChA), polyacrylamide (PAM), and their mixtures are presented. The morphology of the ChA and PAM films and their mixtures was studied by tappingmode atomic force microscopy (AFM). The topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of mixtures by AFM showed a completely different morphology when compared with pure components. The roughness of mixtures increases with the increase of ChA content but is significantly reduced after UV exposure. This may indicate a strong interaction between the polymeric components. The FTIR spectroscopy also supports the obtained results. The miscibility of polymer mixtures is related to interactions between the functional groups of the polymeric components.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 65-71
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological properties of chitosan blends with partially hydrolyzed polyacrylamide in different solvents
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035377.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
apparent shear viscosity
chitosan
polyacrylamide
polymer blends
rheological properties.
Opis:
In the present paper, the results of rheological measurements in solutions of chitosan (Ch) with partially hydrolyzed polyacrylamide (HPAM) are presented. Aqueous acetic acid, lactic acid and aqueous acetic acid/NaCl were used as solvents for chitosan, HPAM and Ch/HPAM solution blends. The criterion of miscibility of solution blends, based on the additivity rule of apparent shear viscosity (ηa) has been discussed. The rheological parameters from power law (Ostwald de Waele model) and activation energy of viscous flow (Ea) have been calculated from the flow curves and Arrhenius plots, respectively. It was found that studied polymer solutions exhibited the non-Newtonian behaviour with shear-thinning and/or shear-thickening areas. The final result depends on the thermodynamic goodness of the solvent and on the blend composition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 53-62
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the intermolecular interaction on physico-chemical properties of chitosan/hyaluronic acid blends
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Grabska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/1034820.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM microscopy
chitosan
hyaluronic acid
polymer blends
viscosity interaction parameters
Opis:
In the present study, the results of viscosity measurements in dilute solutions of chitosan (Ch) with hyaluronic acid (HA) are presented. Chitosan is blended with hyaluronic acid in aqueous 0.1M CH3COOH/0.2M NaCl and 0.3M NaCl respectively, or with the addition of HEPES. Viscosity measurements of dilute polymer solution were carried out in an Ubbelohde capillary viscometer. The intrinsic viscosity, [], and the viscosity interaction parameters, bm, have been determined for the binary (solvent/polymer) and ternary (solvent/polymer A/polymer B) systems. The homogeneity and morphology of chitosan blends were ascertained from the tapping-mode atomic force microscopy. The surface roughness of chitosan, hyaluronic acid and Ch/HA blended films was altered by mixing. The obtained results suggested that there was existence of the strong interactions between chitosan and hyaluronic acid.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 170-176
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface properties of chitosan acetate, polyacrylamide and their mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035217.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
chitosan acetate
contact angle
polyacrylamide
polymer blends
surface properties
Opis:
The surface properties of chitosan acetate (ChA), polyacrylamide (PAM) and ChA/PAM mixtures have been investigated by the tapping-mode atomic force microscopy (AFM) and monitored by contact angle measurements. Chitosan is blended with polyacrylamide in acetic acid solution and this solution is cast to prepare the mixture film. Measurements of the contact angle for two different liquids (diiodomethane and glycerol) on the surface of chitosan acetate. The surface free energy (γs) as well as dispersive (gsd) and polar (gsp) components were calculated from contact angle values by Owens-Wendt methods using an appropriate computer program. The values of polar and dispersive components of surface free energy show that PAM films are more polar than chitosan acetate films. In the case of ChA/PAM mixtures, the values of surface free energy and polar component are reduced significantly compared with pure polymers. This behavior indicates rather hydrophobic character of this surface. The changes of topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of blends by AFM showed a completely different morphology when compared with pure components. The roughness of blends increases with the increase of ChA content. This may indicates a strong interaction between the polymeric components.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 29-34
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal and atomic force microscopy (afm) studies of microcrystalline chitosan/poly(vinyl alcohol) mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035498.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
microcrystalline chitosan
poly(vinyl alcohol)
polymer blends
thermal analysis
Opis:
In the present paper, the results of thermal analysis (DSC and TGA) and atomic force microscopy studies of microcrystalline chitosan (MCCh) with poly(vinyl alcohol) (PVA) are presented. Microcrystalline chitosan is blended with poly(vinyl alcohol) in acetic acid solution and this solution is cast to prepare the blend film. From thermal curves the thermal transitions: Tg, Tm and characteristic temperatures of decomposition: Tdi, Tmax have been determined and compared. The influence of the degree of PVA hydrolysis on the thermal properties of blend systems has been discussed. The surface properties of the MCCh and PVA films and their blends have been studied by tapping-mode atomic force microscopy (AFM). The changes of topography images were considered by determining the root mean square (RMS) deviation in the image data. The obtained results suggested that in solid MCCh/PVA mixtures the components are poorly miscible.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 11-16
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological and mechanical studies of chitosan blends with the addition of an ionic liquid
Autorzy:
Lewandowska, Katarzyna
Szulc, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1034202.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
ionic liquid
mechanical properties
poly(vinyl alcohol)
polymer blends
rheological properties
Opis:
In the present paper, results from rheological measurements and tensile tests of polymer blends containing chitosan and poly(vinyl alcohol) with different additions of an ionic liquid are presented. Flow measurements were carried out using solutions of pure polymers and their blends with and without the addition of an ionic liquid. It has been observed that the polymer solutions and their blends exhibited non-Newtonian behaviour. Rheological parameters from the power law and activation energy of viscous flow were determined and discussed. Mechanical properties, such as the tensile strength and ultimate percentage of elongation of films, have been determined and compared. This study thus shows that the addition of an ionic liquid is an effective method for improving the flexibility of chitosan blends.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 119-126
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
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